The most recent security updates to Debian Lenny included updates to PHP5 which required a recompilation of eAccelerator. Easy enough however the "make test" gave an error: PHP Warning: [eAccelerator] This build of "eAccelerator" was compiled for PHP version 5.2.0-8+etch15. Rebuild it for your PHP version (5.2.6-1+lenny4) or download precompiled binaries. I was able to resolve this by using the commands (note the added 5) : #/usr/bin/phpize5 #./configure --enable-eaccelerator=shared --with-php-config=/usr/bin/php-config5 I can't see any reason why this should make a difference as the phpize and php-config files are symbolic links to /etc/alternatives/ where the symbolic links go back to the phpize5 and php-config5 files: # ls -laL /usr/bin/php* -rwxr-xr-x 1 root root 5318592 2009-11-22 15:49 /usr/bin/php -rwxr-xr-x 1 root root 5318592 2009-11-22 15:49 /usr/bin/php5 -rwxr-xr-x 1 root root 4053 2009-11-22 15:49 /usr/bin/php-config -rwxr-xr-x 1 root root 4053 2009-11-22 15:49 /usr/bin/php-config5 -rwxr-xr-x 1 root root 4141 2009-11-22 15:49 /usr/bin/phpize -rwxr-xr-x 1 root root 4141 2009-11-22 15:49 /usr/bin/phpize5 # diff /usr/bin/php-config /usr/bin/php-config5 # diff /usr/bin/phpize /usr/bin/phpize5 # Can anyone see what has gone wrong?